Flagger training and certification requirements

From Connecticut Department of Transportation Standard Specifications for Roads, Bridges, Facilities and Incidental Construction:
“Uniformed Flagger: Uniformed Flaggers shall be persons who have successfully completed flagger training by the American Traffic Safety Services Association (ATSSA), National Safety Council (NSC), or other such training approved by the Engineer. A copy of the Flagger’s training certificate shall be provided to the Engineer before the Flagger performs any Project work. The credentials and conduct of Uniformed Flaggers shall comply with the requirements of Chapter 6E, Flagger Control in the Manual of Uniformed Traffic Control Devices (MUTCD). Uniformed Flaggers shall wear high-visibility safety apparel and use a STOP/SLOW paddle that is at least 18 inches wide with letters at least 6 inches high. The paddle shall be mounted on a pole of sufficient length to be 6 feet above the ground as measured from the bottom of the
sign.

Uniformed Flaggers shall be used only on non-limited access highways for the purpose of controlling traffic operations and only when authorized to do so in writing by the Engineer.”

See CTDOT Acceptable Flagger Programs for a list of approved programs.